40 t钢包底吹氩过程流热耦合的数值模拟

Numerical Simulation on the Flow-heat Coupling Field of 40 t Bottom Argon Blowing Ladle

根据宝钢40 t钢包底吹氩过程的现场资料,建立了钢包底吹氩过程钢水流热耦合的多相数值模型。并计算了吹氩量对钢水流场及温度场的影响。结果表明,钢包底吹氩过程主要影响的区域位于钢包上半部,并随着吹氩量的增加,影响区域扩大。钢包内钢液流动速度为0.02~0.04 m/s的区域所占比例最大,并随吹氩量的增加比例不断增大。钢包底部的死区比例随吹氩量的增加而减小。钢包底吹氩过程中钢包内的钢液主要通过顶部散热,钢液顶部会出现明显的温降,随着吹氩量的增加,钢液顶部温降更加显著。

Based on the actual data of 40 t bottom argon blowing process in Baosteel,a multiphase numerical model considering the flow-heat coupling field of liquid steel was established.The influences of argon flow rates on the flow field and temperature field of liquid steel were investigated by calculation. The results showed that the main influence area of ladle bottom blowing argon process was located in the upper part of ladle,and this area enlarged with the increase of argon flow rate. The liquid steel in ladle with the flow velocity ranging from 0. 02 m/s to 0. 04 m/s accounted for the largest proportion,and increased with the increase of argon flow rate. The dead zone ratio at the bottom of the ladle decreased with the increase of argon flow rate. During the ladle bottom blowing argon, the liquid steel in ladle was mainly cooled through the top part. The temperature drop of the liquid steel at the top part was obvious,and became more remarkable with the increase of argon flow rate.